Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b23a564f083d3b6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 01:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b83b7f7724e5d0d70f35c23d0da78e57 SHA-1: 9a563c747a045b69d411ba05b787be2ef3510524 SHA-256: 2b23a564f083d3b619bd10b199b1d640b81faddcbf0c2f21615077aa747f6732
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics identified it as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.nstoplana.rs/ckfinder/userfiles/files/24296575532.pdf In PDF document text
    • http://chinalabware.net/d/files/galunekomufateduset.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/33619115159.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/nirirodexusuv.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/miwilu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff4f7cf2a---pidozipakigonudozopimanox.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/38175656850.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/derijazafenuzanutajufa.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/nifovexewijorumebi.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/53106059276.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tabojusoduranenokab.pdfIn PDF document text
    • https://laser123.com/geektic/files/bidevotul.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/domesalajuxaludafufi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/fapofesolaxenol.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/92209474542.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/35176192920.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/51666705569.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/marejawikamubedapa.pdfIn PDF document text
    • http://castel.lu/userfiles/files/rubozuk.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/12208930643.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139191b84343---rujudodafuje.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/73602570812.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/15292375831.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pedumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=colmi+p8+price+in+bangladeshPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 11240 bytes
SHA-256: bc6a235455a4a18f366591ba2cee7552c4439a66d8bff0ecf3158479fcc43256
font_01_sfnt_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 16372 bytes
SHA-256: a6f31a15db8b590b9bb6f56643a8d1f063e2150f91de06d734fff1302f25e73e

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